| 从影响线角度研究3塔悬索桥力学行为 |
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| 引用本文： | 梁鹏,吴向男,李万恒,徐岳.从影响线角度研究3塔悬索桥力学行为[J].公路交通科技,2011,28(4). |
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| 作者姓名： | 梁鹏 吴向男 李万恒 徐岳 |
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| 作者单位： | 长安大学陕西省公路桥梁与隧道重点实验室;交通运输部公路科学研究院; |
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| 基金项目： | 国家科技支撑计划项目(2009BAG15B01); 国家自然科学基金青年项目(50808019); 中央高校基本科研业务费专项资金项目(CHD2009JC024); 长安大学基础研究支持计划专项基金项目 |
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| 摘 要： | 以泰州长江大桥为原型,建立相应2塔、3塔漂浮和3塔约束悬索桥空间有限元模型,研究各关键效应的影响线特征及汽车效应包络,得到如下结论:主缆抗滑、中塔受力、主梁挠跨比、梁端水平位移等在2塔悬索桥中不会引起很多关注的因素,对3塔悬索桥却成为控制指标,且由汽车作用控制;缺乏边缆的有效约束引起中塔顶水平位移增大,是导致其他效应大幅增加的原因;当一个主跨全部或部分加载,另一个主跨空载时,4个控制因素最不利,但发生的概率极低;抓住规范限制挠跨比的本质和3塔2跨悬索桥变形特点,可将其挠跨比限制放宽至1/220,行车平顺仍有充足保障;汽车与恒载应力叠加后,绝大多数运营状况下,中塔都处于受压应力状态,疲劳问题不突出。
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| 关 键 词： | 桥梁工程 3塔悬索桥 空间有限元 影响线 抗滑安全系数 挠跨比 |
Study on Mechanical Behaviour of Three-tower Suspension Bridge Based on Influence Line |
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| LIANG Peng,WU Xiangnan,LI Wanheng,XU Yue.Study on Mechanical Behaviour of Three-tower Suspension Bridge Based on Influence Line[J].Journal of Highway and Transportation Research and Development,2011,28(4). |
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| Authors: | LIANG Peng WU Xiangnan LI Wanheng XU Yue |
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| Institution: | LIANG Peng1,WU Xiangnan1,LI Wanheng2,XU Yue1 (1.Key Laboratory for Highway Bridge and Tunnel of Shaanxi Province,Chang'an University,Xi'an Shaanxi 710064,China,2.Research Institute of Highway Ministry of Transport,Beijing 100088,China) |
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| Abstract: | Based on the Taizhou Yangtze River Bridge,3D space finite element models of two-tower,three-tower with floating system and three-tower with elastic cable between mid-tower and girder were constructed.Through analysis of influence lines' characteristics of various key effects and effect envelop due to vehicular load,the conclusions were got as follows:(1) Some factors such as anti-slipping safety factor between the main cable and saddle of the mid-tower,force in the mid-tower,deflection-span ratio of girder,... |
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| Keywords: | bridge engineering three-tower suspension bridge space finite element influence line anti-slipping safety factor deflection-span ratio |
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